I presumed that ! Left bass
I was just trying to explain why we do it. I can completely understand why it gives you a fright. And if we are lucky we can time it just as you have a mouthfull of tea
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For us its a bit like when we have taken a climb clearance while still climbing and just as we get +300ft through the previous cleared level the controller then gives the climb clearance again.
It never fails to make my bum twitch "have we just level busted, I am sure he cleared us for that already, did we take the wrong call." etc etc
And don't worry if there is something on the runway or something we don't like we will say a bit more than "say again clearance" which is the way I ask.
Leading questions and all that good stuff about not using the T or L word unless it is a clearance.